Ball valve



FIG. 1 is a front elevational view of a ball valve showing my newdesign;

FIG. 2 is a right side elevational view thereof; the left sideelevational view being a mirror image;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a top plan view thereof.

An ornamental design for a ball valve, as shown.